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ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full... more
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
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... Record Details. Record ID, 516426. Record Type, conference. Author, Agata Bajek [802000438455] - Ghent University Agata.Bajek@UGent.be; Ana Lozano Vila - Ghent University; Stijn Monsaert [801002093843] - Ghent University... more
... Record Details. Record ID, 516426. Record Type, conference. Author, Agata Bajek [802000438455] - Ghent University Agata.Bajek@UGent.be; Ana Lozano Vila - Ghent University; Stijn Monsaert [801002093843] - Ghent University Stijn.Monsaert@UGent.be; ...
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A highly active NHCeNi(II) molecular catalyst for HER under completely aqueous conditions. The catalyst achieves an i c /i p ¼ 75,
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The potential benefits of microwave irradiation for fructose dehydration into 5 hydroxymethylfurfural (5-HMF) have been quantified over a sulfonated metal–organic framework (MOF), MIL 101(Cr)-SO3H. The effects of temperature (140–170 °C),... more
The potential benefits of microwave irradiation for fructose dehydration into 5 hydroxymethylfurfural (5-HMF) have been quantified over a sulfonated metal–organic framework (MOF), MIL 101(Cr)-SO3H. The effects of temperature (140–170 °C), batch time (5–300 min), and catalyst-to-substrate ratio (0.1–0.01 g/g) were systematically mapped. After 10 min of microwave (MW) irradiation at 140 °C in a DMSO–acetone reaction medium, practically complete fructose conversion was obtained with a 70% yield of 5-HMF. Without MW, i.e., using conventional heating (CH) at the same conditions, the fructose conversion was limited to 13% without any 5-HMF yield. Rather, 90 min of CH was required to reach a similarly high conversion and yield. The profound impact of moving from CH towards MW conditions on the reaction kinetics, also denoted as the microwave effect, has been quantified through kinetic modeling via a change in the Gibbs free energy of the transition state. The modeling results revealed an e...
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Metal-organic frameworks (MOFs) are porous coordination polymers with interesting structural frameworks, properties, and a wide range of applications. A novel 3D cadmium(II)-carboxylate framework, CdMOF ([Cd2(L)(DMF)(H2O)2]n), was... more
Metal-organic frameworks (MOFs) are porous coordination polymers with interesting structural frameworks, properties, and a wide range of applications. A novel 3D cadmium(II)-carboxylate framework, CdMOF ([Cd2(L)(DMF)(H2O)2]n), was synthesized by the solvothermal method using a tetracarboxylic bridging linker having amide functional moieties. The CdMOF crystal structure exists in the form of a 3D layer structure. Based on the single-crystal X-ray diffraction studies, the supramolecular assembly of CdMOF is explored by Hirshfeld surface analysis. The voids and cavities analysis is performed to check the strength of the crystal packing in CdMOF. The CdMOF followed a multistage thermal degradation pattern in which the solvent molecules escaped around 200 °C and the structural framework remained stable till 230 °C. The main structural framework collapsed (>60 wt.%) into organic volatiles between 400–550 °C. The SEM morphology analyses revealed uniform wedge-shaped rectangular blocks w...
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Hydroxymethylfurfural (5‐HMF) is a vital biomass‐derived platform chemical for the production of secondary value‐added chemicals. In this work, fructose conversion into 5‐HMF over metal–organic framework (MOF) has been considered. Several... more
Hydroxymethylfurfural (5‐HMF) is a vital biomass‐derived platform chemical for the production of secondary value‐added chemicals. In this work, fructose conversion into 5‐HMF over metal–organic framework (MOF) has been considered. Several MOF‐based catalysts were synthesized and examined in fructose dehydration into 5‐HMF via a microwave‐assisted reactor. Each MOF's catalytic performance was evaluated concerning its surface area, pore size, and acid density. The results showed satisfactory fructose conversion levels for all studied MOFs in the range of 60%–99%. As a catalyst, zeolitic imidazolate frameworks (ZIFs) resulted in excellent fructose conversion, but interestingly, higher quantities of side products such as formic and levulinic acids were produced. The higher 5‐HMF yields, up to 90%, were obtained over the MIL‐101 (MIL, Materials Institute Lavoisier) family, such as MIL‐101‐SO3H. This result is ascribed to the fact that functionalized MOF possesses hydrothermal stabili...
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Abstract A catalyst series of zeolitic imidazole frameworks (ZIFs) with a sodalite (SOD) structure was explored as an effective heterogeneous catalyst for l -lactide polymerization into biodegradable polylactides (PLAs). The catalyst... more
Abstract A catalyst series of zeolitic imidazole frameworks (ZIFs) with a sodalite (SOD) structure was explored as an effective heterogeneous catalyst for l -lactide polymerization into biodegradable polylactides (PLAs). The catalyst series of ZIF-8, ZIF-67, and bimetallic ZnCo-ZIF was synthesized under the green method (room temperature synthesis), which contained a variance in the metal species/contents. The chemical and physical properties of catalysts were characterized by several techniques to illustrate the relation between catalyst properties and catalytic performance. The results indicated that the metals in the ZIF structure revealed an influencing role in catalytic activities, kinetic rates, and properties of polymer products under bulk ring-opening polymerization of l -lactide. Moreover, the best performing ZIF showed potential as a heterogeneous catalyst since it could be reused at least four times without significant loss of catalytic activity.
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Abstract The continually growing level of ecotoxicants generates a request for principal new strategies to safeguard the environment. In this contribution, we proposed a comprehensive approach to solving two emerging problems: recycling... more
Abstract The continually growing level of ecotoxicants generates a request for principal new strategies to safeguard the environment. In this contribution, we proposed a comprehensive approach to solving two emerging problems: recycling polyethylene terephthalate wastes (PET) and removing toxic insecticides from water. The developed technology consumed PET bottles as the source and support for the growth of UiO-66 frameworks and were further applied for the removal of imidacloprid from water. The prepared material was characterized by a range of microscopic and spectroscopic techniques confirming the high loading and homogenous distribution of UiO-66 across the PET support. The sorbent (PET@UiO-66) delivered considerable technical advantages beyond the convenient sorbents: sustainable and cheap preparation; high adsorption capacity and rate; stability and recyclability; 100 times enhanced permeability compared to UiO-66 powder; and applicability in fixed-bed columns. We believe that the proposed design and technological relevance will be a basis for the further developing of the smart utilization of wastes for sustainable functional materials.
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Cesium salts (Cs2CO3, CsCl, and CsNO3) were used for the coupling of CO2 and epoxides.
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Abstract 3D metal N-doped carbon frameworks (M-NCFs) are produced from the direct pyrolysis of 2D zeolitic imidazolate frameworks (ZIF-L Zn and Co) in a reducing atmosphere. The effects of the thermal treatment were studied in order to... more
Abstract 3D metal N-doped carbon frameworks (M-NCFs) are produced from the direct pyrolysis of 2D zeolitic imidazolate frameworks (ZIF-L Zn and Co) in a reducing atmosphere. The effects of the thermal treatment were studied in order to achieve the desired catalyst. The results show that metal nanoparticles and N-doping species present in the carbon matrix have a direct influence on the catalytic performance. Zn/NCF-1000 displayed quantitative conversion and selectivity towards the chemical fixation of carbon dioxide through the cycloaddition with epoxides. Furthermore, the magnetic property of the newly synthesized Co/NCF-600 was used to demonstrate its superior stability and recyclability, retaining the same catalytic activity for more than 10 cycles.
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We demonstrate herein the ZIF-8-only-mediated catalysis of the cyclodimerization of epichlorohydrin to 2,5-bis(chloromethyl)-1,4-dioxane in the absence of co-catalyst and solvent. The easy handling and economic aspects of ZIF-8, in... more
We demonstrate herein the ZIF-8-only-mediated catalysis of the cyclodimerization of epichlorohydrin to 2,5-bis(chloromethyl)-1,4-dioxane in the absence of co-catalyst and solvent. The easy handling and economic aspects of ZIF-8, in addition to the one-step reaction to produce the cyclodimer, make this catalyst attractive even for industry. It has been clearly illustrated that the nature of the method used to synthesize ZIF-8 affected the yields of the cyclodimers. Specifically, the method employed to produce ZIF-8 directly influences the amount of crystal structural defects, which in turn impacts their performance as catalysts. To emphasize the role of defects, other physical properties, such as surface area and particle size, were controlled during the synthesis of the ZIF-8 catalysts. Remarkably, the amount of structural defects was quantified by temperature program desorption analysis.
Research Interests: Chemistry, Inorganic Chemistry, Microscopy, Carbon Dioxide, Catalysis, and 15 morePolymerization, Zeolites, Metal Organic Frameworks, Surface, Zinc, X ray diffraction, Zeolitic Imidazolate Frameworks, Capture, Solvent, Epoxides, Catalytic Activity, Copolymerization, BASE, Structural Defects, and epichlorohydrin
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A novel synthesis of diastereoselective pure periodic mesoporous ethenylene-silicas is presented, using (a) the homemade E-diastereoisomer of bis(triethoxysilyl)ethene, (b) a more efficient extraction procedure of the template P123 and... more
A novel synthesis of diastereoselective pure periodic mesoporous ethenylene-silicas is presented, using (a) the homemade E-diastereoisomer of bis(triethoxysilyl)ethene, (b) a more efficient extraction procedure of the template P123 and (c) an ultra-fast synthesis procedure.
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MOF-derived carbon-based materials have attracted widespread attention due to their relatively large surface area, morphology, and their stability in water. Considering these advantages, these materials present themselves as excellent... more
MOF-derived carbon-based materials have attracted widespread attention due to their relatively large surface area, morphology, and their stability in water. Considering these advantages, these materials present themselves as excellent adsorbents. In this work, a novel method was designed for the fabrication of a nano zero-valent-iron (nZVI) carbon composite. The utilization of zinc oxide nanorods (ZnONRs) in the role of sacrificial consumable nuclei for the synthesis of MIL-53 sacrificial zinc oxide nanorods (MIL-53-SNR) and the subsequent pyrolysis at 700 °C in the inert atmosphere led to a graphitic-supported nZVI material (Fe-C-SNR). Fe-C-SNR was compared with a commercial zinc oxide bulk (MIL-53-SB) and with a pristine MIL-53. By virtue of the ZnONRs, Fe-C-SNR exhibited a greatly improved mesoporous structure. Consequently, the pyrolyzed materials were applied as adsorbents for methylene blue. Fe-C-SNR’s performance increased to more than double of the pyrolyzed MIL-53 (Fe-C), w...
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The reactivity and activation parameters for the ROMP of eight norbornene esters in the presence of a N-chelating Hoveyda–Grubbs II type catalyst were determined. Kinetic studies prove that these parameters highly depend on the monomer... more
The reactivity and activation parameters for the ROMP of eight norbornene esters in the presence of a N-chelating Hoveyda–Grubbs II type catalyst were determined. Kinetic studies prove that these parameters highly depend on the monomer structures.
Research Interests: Chemistry, Polymer Chemistry, Catalysis, Polymerization, EDTA Chelation, and 5 moreMetathesis, RSC, Monomer, ROMP, and Norbornene
In the present investigation, radiosynthesis of the (99m)Tc-tricarbonyl moxifloxacin dithiocarbamate complex ((99m)Tc(CO)(3)-MXND) and its biological evaluation in male Wister rats (MWR) artificially infected with Staphylococcus aureus... more
In the present investigation, radiosynthesis of the (99m)Tc-tricarbonyl moxifloxacin dithiocarbamate complex ((99m)Tc(CO)(3)-MXND) and its biological evaluation in male Wister rats (MWR) artificially infected with Staphylococcus aureus (S. aureus) was assessed. The (99m)Tc(CO)(3)-MXND complex was radiochemically examined in terms of stability in saline and in serum and biologically its in-vitro binding with S. aureus and percent absorption in MWR models. Radiochemically the (99m)Tc(CO)(3)-MXND complex showed more than 90% stability in saline up to 240 min and in serum 14.95% undesirable species was appeared within 16h. In-vitro the (99m)Tc(CO)(3)-MXND complex showed saturated binding with S. aureus. In MWR artificially infected with live S. aureus the complex showed about six fold higher uptakes in the infected muscle as compared to the normal muscle. However, insignificant change in the uptake of (99m)Tc(CO)(3)-MXND complex in the infected and inflamed or normal muscle was observed in the MWR infected with heat killed S. aureus. The (99m)Tc(CO)(3)-MXND complex disappeared from the circulatory system and appeared in the urinary system within 60-90 min followed by excretion through normal route of urinary system. Based on the elevated and stable radiochemical succumb in saline, serum, saturated in-vitro binding with S. aureus and higher accumulation in the target organ of the MWR, we recommend the (99m)Tc(CO)(3)-MXND complex for radio-localization of the infection induced by S. aureus in human.
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Research Interests: Chemistry, Inorganic Chemistry, Design, Crystallography, Lanthanide, and 15 morePhotoluminescence, Crystal structure, Metal Organic Frameworks, Magnetic Properties, Luminescence, Lanthanides, Metal, Three Dimensional, Coordination Polymer, Chain, Pyridine, Complexes, Coordination Polymers, Hydrothermal Reaction, and D
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Homogeneous electrochemical water oxidation under neutral conditions using impressively stable vitamin B12.
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Much has been written about the fundamental aspects of the metal–organic frameworks (MOFs). Still, details concerning the MOFs with structural flexibility are not comprehensively understood. However, a dramatic increase in research... more
Much has been written about the fundamental aspects of the metal–organic frameworks (MOFs). Still, details concerning the MOFs with structural flexibility are not comprehensively understood. However, a dramatic increase in research activities concerning rigid MOFs over the years has brought deeper levels of understanding for their properties and applications. Nonetheless, robustness and flexibility of such smart frameworks are intriguing for different research areas such as catalysis, adsorption, etc. This manuscript overviews the different aspects of framework flexibility. The review has touched lightly on several ideas and proposals, which have been demonstrated within the selected examples to provide a logical basis to obtain a fundamental understanding of their synthesis and behavior to external stimuli.
Research Interests: Computer Science, Chemistry, Catalysis, Catalysts, Molecular Dynamics, and 11 moreMechanical properties, Metal Organic Frameworks, Metal Organic Framework, Flexibility, Characterization, Phase transition, Flexibility in engineering design, Crystal Structures, Reticular Chemistry, Coordination Polymers, and Thermal Expansion
A new heterogeneous NHC catalyst (Ag-NHC-MOF) was synthesized by the post-synthetic modification of an azolium-containing metal-organic framework. The structure of the catalyst was well defined and fully characterized using various... more
A new heterogeneous NHC catalyst (Ag-NHC-MOF) was synthesized by the post-synthetic modification of an azolium-containing metal-organic framework. The structure of the catalyst was well defined and fully characterized using various techniques such as PXRD, FE-SEM, HR-TEM, XPS, FT-IR, TGA, BET, 1H-NMR, 13C-NMR, EDS, and ICP. The catalyst showed an excellent activity towards the A3-coupling reaction with a broad substrate scope. The A3-coupling reaction was performed under ambient conditions and full conversion was reached within just 1 hour for the model reaction. The heterogeneous silver NHC MOF (Ag-NHCMOF) catalyst can be recycled and reused at least four times without a significant loss of activity. In comparison with previously reported heterogeneous catalysts applied for the A3-coupling reaction, the Ag-NHC-MOF demonstrates a superior performance for the A3-coupling reaction.
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Two mononuclear ruthenium complexes [RuL(pic)3] (1) and [RuL(bpy)(pic)] (2) (H2L = 2,6-pyridinedicarboxylic acid, pic = 4-picoline, bpy =2,2'-bipyridine) have been synthesized and... more
Two mononuclear ruthenium complexes [RuL(pic)3] (1) and [RuL(bpy)(pic)] (2) (H2L = 2,6-pyridinedicarboxylic acid, pic = 4-picoline, bpy =2,2'-bipyridine) have been synthesized and fully characterized. Both complexes could promote water oxidation chemically and photochemically. Compared with other known ruthenium-based water oxidation catalysts using [Ce(NH4)2(NO3)6] (Ce(IV)) as the oxidant in solution at pH 1.0, complex 1 is one of the most active catalysts yet reported with an initial rate of 0.23 turnover s(-1). Under acidic conditions, the equatorial 4-picoline in complex 1 dissociates first. In addition, ligand exchange in 1 occurs when the Ru(III) state is reached. Based on the above observations and MS measurements of the intermediates during water oxidation by 1 using Ce(IV) as oxidant, [RuL(pic)2(H2O)](+) is proposed as the real water oxidation catalyst.
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A systems chemistry approach is taken for compartmentalization of a continuous reaction medium (water and CO2) with induced creation of micro-heterogeneity in the medium by using a SOM (soft-oxometalate) catalyst.
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Water oxidation has become very popular due to its prime role in water splitting and metal–air batteries. Thus, the development of efficient, abundant, and economical catalysts, as well as electrode design, is very demanding today. In... more
Water oxidation has become very popular due to its prime role in water splitting and metal–air batteries. Thus, the development of efficient, abundant, and economical catalysts, as well as electrode design, is very demanding today. In this review, we have discussed the principles of electrocatalytic water oxidation reaction (WOR), the electrocatalyst and electrode design strategies for the most efficient results, and recent advancement in the oxygen evolution reaction (OER) catalyst design. Finally, we have discussed the use of OER in the Oxygen Maker (OM) design with the example of OM REDOX by Solaire Initiative Private Ltd. The review clearly summarizes the future directions and applications for sustainable energy utilization with the help of water splitting and the way forward to develop better cell designs with electrodes and catalysts for practical applications. We hope this review will offer a basic understanding of the OER process and WOR in general along with the standard pa...
MOFs exhibit inherent extraordinary features for diverse applications ranging from catalysis, storage, and optics to chemosensory and biomedical science and technology. Several procedures including solvothermal, hydrothermal,... more
MOFs exhibit inherent extraordinary features for diverse applications ranging from catalysis, storage, and optics to chemosensory and biomedical science and technology. Several procedures including solvothermal, hydrothermal, mechanochemical, electrochemical, and ultrasound techniques have been used to synthesize MOFs with tailored features. A continued attempt has also been directed towards functionalizing MOFs via “post-synthetic modification” mainly by changing linkers (by altering the type, length, functionality, and charge of the linkers) or node components within the MOF framework. Additionally, efforts are aimed towards manipulating the size and morphology of crystallite domains in the MOFs, which are aimed at enlarging their applications window. Today’s knowledge of artificial intelligence and machine learning has opened new pathways to elaborate multiple nanoporous complex MOFs and nano-MOFs (NMOFs) for advanced theranostic, clinical, imaging, and diagnostic purposes. Succe...
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In recent years, the olefins metathesis has established itself as a powerful tool for carbon-carbon bonds forming and has found numerous applications in polymer chemistry. One of the important directions of metathesis is the... more
In recent years, the olefins metathesis has established itself as a powerful tool for carbon-carbon bonds forming and has found numerous applications in polymer chemistry. One of the important directions of metathesis is the polymerization with cycle opening. A study of new ruthenium catalysts, resistant to the many functional groups effects, has showed the possibility of synthesizing functionalized polymers with unique properties. In this chapter, reactivity and activation parameters of eight different norbornene dicar-boxylic acid alkyl esters in the presence of a Hoveyda-Grubbs II catalyst for the ring opening metathesis polymerization were determined by 1 H NMR analysis in-situ. The molecules of esters differ in the aliphatic radical structure and the location of the sub-stituent groups. Kinetic studies have shown that effective polymerization constants and activation parameters strongly depend on the monomer structure. It is shown that the elongation of the aliphatic radical does not significantly affect the reactivity, but significantly changes the activation parameters. The branching of the aliphatic radical significantly affects both the reactivity of the corresponding ester and the activation parameters of the polymerization. The position of the substituents in the norbornene ring of the ester also has a significant effect on the activation parameters of metathesis polymerization.